206 



THE BELL SYSTEM TECHNICAL JOURNAL, JANUARY 1954 



tion. The effect of known changes in these two latter factors may be 

 determined by the observed vertical shift in this logarithmic plot, 

 corresponding to changes in 6li and dGia/dx. The effect of a change in 

 He is a change in the value of (A^7)c to be subtracted from (NI + (NI)c) 

 in determining AU. From these results there could be prepared curves 

 giving the relation between F and NI for different combinations of the 

 several variables for which allowance should be made. 



5 EVALUATION OF CONDUCTANCE 



The preceding sections have described procedures for estimating and 

 measuring all the terms entering the expressions for the release time 

 except the conductance G. This ciuantity is the sum of the sleeve con- 

 ductance Gs and the eddy current conductance Ge ■ In some cases a 

 short circuited winding may be used instead of a sleeve : in such cases G 

 is the sum of Ge and the coil constant of the winding, Gc or A^ /R. 



Sleeve Conductance 



The conductance of a cylindrical sleeve is the sum of the conductances 

 of the differential shells of length f, radius r and thickness 5r, as indi- 



.^^'^-1 



Sleeve conductance relations. 



